response Type is set to wrong one(json) when the actual response is a string with Content-Type "text/plain"

[PrasadRasapally]

I'm submitting a bug report

• Library Version:
  0.11.0

Please tell us about your environment:

• Operating System:
  Windows [7] professional

• Node Version:
  4.6.1

• NPM Version:
  3.8.9

• JSPM OR Webpack AND Version
  JSPM 0.16.32

• Browser:
  IE 11

• Language:
  ESNext(ES - 6), angularjs

Current behavior:
In IE-11 the headers.headers['Content-Type'] of HttpResponseMessage is always being undefined. So the response type is set to wrong one(json), Even if I am getting the response from the server as a string with content-type text/plain. So getting "invalid character" Error when tried to parse the string response#151

 if (this.responseType === 'json') {
        this._content = JSON.parse(this.response, this.reviver);
        return this._content;
  }

Expected/desired behavior:

• What is the expected behavior?
  It should not parse the response when the response is a string with content-type text/plain. So as to prevent the "Invalid character" error in IE-11.
• What is the motivation / use case for changing the behavior?

[PrasadRasapally]

The language is ECMA Script 6.

[EisenbergEffect]

Submit a PR for the fix, but only if you can reliably determine the content type to be text. The PR should not change the default behavior in other scenarios.

[Alexander-Taran]

@bigopon

async triageQuestion(id) =>{
 respondSameDay()
 let response = await getResponseFromOP( { timeout : fromYears(6) } )
 if(!response) {
    closeQuestion(id,randomReason())
 }
}

also.. IE.EOL == true